By F. Vasco Costa (auth.), Eivind Bratteland (eds.)

Two past NATO complicated examine Institutes (ASI) on berthing and mooring of ships were held; the 1st in Lisboa, Portugal in 1965, and the second one at Wallingford, England in 1973. those ASls have contributed considerably to the lower than­ status and improvement of fenders and mooring, as have works by way of Oil businesses foreign Marine discussion board (1978) and PIANC (1984). advancements in send sizes and construction of recent really expert terminals at very uncovered destinations have necessitated additional advances within the mixed mooring and fendering know-how. Exploration and exploitation of the continental cabinets have additionally led to new and demanding difficulties, advancements and strategies. Offshore actions and advancements have in­ fluenced and more advantageous wisdom approximately either ships and different floating constructions that are berthed and/or moored below a variety of environmental stipulations. The scope of this ASI used to be to offer fresh advances in berth­ ing and mooring of ships and mooring of floating offshore buildings, concentrating on versions and instruments to be had with a view in the direction of protection and aid of frequencies and results of accidents.

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Extra info for Advances in Berthing and Mooring of Ships and Offshore Structures

Sample text

This is sometimes a MUST when tugs are difficult to obtain due to remote location of the terminal. The availability of tugs (or the lack of tugs) is the main reason for the development of systems using quaybased winches for hauling as well as for mooring. The winch method has proven to be, not only practial, but economical. The mooring winches on the quay or pier provied additional safety to the entire operation as well as to safety at berth. Tug boats, however, are still rather weak instruments for maneuvering.

The development of transportation systems for oil products made it - for reasons of safety - necessary to establish tanker terminals either in remote areas of existing ports or outSide existing ports. This immediately brought up the question of site selection for facilities handling inflammable and explosive cargoes. The situation further aggrevated with the introduction of LNG and LPG-vessels, which increased the demands to operational safety. Safety requirements in the principal areas are recognized universally, but so far no international standards have been adopted.

1 124/. 05 68 70 75 80 1985 YR FIGURE 1. Fractures divide by no. of semisubs /24/. e. the proposed slackening/hauling procedure may increase the probability of line failure. 02 in 1984 and 1985/24/, /25/. - For 1986 - 1987 the frequency has been reduced. -Approximately 40% of the reported fractures (K3 and K4 quality chains) were with chains of less than 2 years age /24/. - The chain fractures occur at almost all tension levels. -The frequency of mUltiple line failure has been rather high, in the range 10- 2 - 10- 3 per rig year.

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